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13 Cards in this Set
- Front
- Back
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Cap Style Shell Shape |
Hard substrate in an energetic shoreline |
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Trochiforn/Turbinite |
low to med conispiral, epifaunal |
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high conispiral |
partially buried, hard surfaces |
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irregular |
reef buulding, encrusting gastro |
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When do the Pulmata appear, and when do they diversify? |
Late Paleo, but great diversification in the cretaceous |
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What are the living modern Cephalopods? |
Cuttlefish, Squid, OCtopus, Argonauts |
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What is a Siphuncle? |
Is a tube in the interior of the shell, cutting through empty sections of the shell. This is used for gas/liquid exchange to constantly maintain a density for the level of water the Nautiloid is in. |
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What is Cameral? |
Calcite deposit in the shell due to seawater being deposited overtime via the siphuncle |
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What are the subclasses of cephalopods |
Nautilodea, Actinoceratoidea, endoceratodea, bactritoidea, ammonoidea, coleoidea |
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What do fast swimming nautiloids have? |
unornamented shells, streamlined, keel |
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Slow swimmers |
Ornamented shell, rounded cross section |
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What is the geological significance of Cephalopods? |
Common and easy to identify for biostratigraphy, nautiloids great for O,S,D, ammoids for D-K. Good for paleography to show opening/closing of seaways, Belemite guard is used for the paleoclimite. |
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Stromataloids |
Part of the sclerosponges, high economic value do to it hosting hydrocarbon deposits. Contain Astrorhiza with mini oscula |
